C# 在C中将sql查询转换为linq

嗨，有人能帮我用Linq C写下面的查询吗

select YearValue from [Information].Year 
where YearId in (select max(YearId) from curreny where BudgetCodeId = 2)

以下是我尝试过的：

var maxYear = 
    from year in dbContext.Years 
    join exchange in dbContext.CurrencyExchangeRates 
    on year.YearId equals exchange.YearId 
    where exchange.BudgetCodeId == budgetCodeId 
    orderby year.YearValue descending 
    select new { yearValue = year.YearValue };

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这就是你要找的：

var maxYear = from year in dbContext.Years where (from exchange in dbContext.CurrencyExchangeRates where exchange.BudgetCodeId == 2 select exchange)
    .Max(m => m.YearId) == 
        year.YearId select year.YearValue;

int mYear = maxYear.First();

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到目前为止你试过什么？这不是一个代码编写服务。我试过这样做，但没有得到想要的输出。var maxYear=dbContext中的from year.Years加入dbContext.currencyExchanges于year.YearId等于exchange.YearId，其中exchange.BudgetCodeId==BudgetCodeId orderby year.YearValue降序选择新建{yearValue=year.yearValue}；这与您所追求的SQL完全不同。什么是货币兑换率？为什么您要按年份值订购？我想从年份表中获取年份值，其中yearId取自currencyexchangeRate表，并且该年份id应为最大值您听说过或尝试过查看LinqPad吗。我发现它对这样的事情很有用。